Acetic acid distillation device

Abstract

The utility model relates to the technical field of acetic acid distillation, and discloses an acetic acid distillation device which comprises a distillation retort, the distillation retort is respectively provided with a liquid feeding port and a discharge port, a plurality of layers of cavities are arranged in the distillation retort from top to bottom in a communicating manner, and exhaust pipelines are arranged in the plurality of layers of cavities in a communicating manner; wherein the steam pipeline is guided in from the cavity in the upper layer and is coaxially wound at intervals for multiple channels in the cavity in each layer in the circumferential direction in a reducing mode to form multiple heating channels, an annular partition plate is arranged between every two adjacent heating channels, a longitudinal partition plate is arranged on one side of each annular partition plate in the radial direction, and the longitudinal partition plate is arranged on the other side of each annular partition plate in the radial direction. A flowing opening is formed between the longitudinal partition plate and the annular partition plate. According to the device, the retention time of acetic acid in the steam pipeline can be prolonged, sufficient exchange with steam heat is realized, the utilization rate of the steam heat is improved, the distillation effect is enhanced, meanwhile, energy waste is reduced, resources are saved, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of acetic acid distillation, in particular to an acetic acid distillation device. Background Art

[0002] Acetic acid distillation utilizes the high volatility of acetic acid. During the distillation process, according to the volatility and boiling point differences of different substances, acetic acid is separated from other impurities. In the existing distillation operation, acetic acid is usually directly introduced into a distillation tank to exchange heat with a steam pipeline conveyed in the distillation tank, so as to achieve the purpose of distillation and purification. Since acetic acid and steam are in a flowing state throughout the process, in this way, the contact time between acetic acid and the steam pipeline is usually short. On the one hand, the distillation effect is not good, and the acetic acid cannot be fully heated and evaporated, resulting in low purification efficiency. On the other hand, the heat of the steam is not fully utilized, and the steam carrying heat is discharged prematurely, causing waste of energy. Therefore, there is an urgent need for an acetic acid distillation device that can extend the contact time between acetic acid and the steam pipeline, improve the distillation effect, and reduce energy waste. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an acetic acid distillation device, which can extend the residence time of acetic acid in the steam pipeline, realize full heat exchange with steam, improve the utilization rate of steam heat, enhance the distillation effect, reduce energy waste, save resources, and has strong practicability.

[0004] The utility model adopts the following technical solutions:

[0005] An acetic acid distillation device includes a distillation tank, a liquid adding port and a discharge port are respectively arranged on the distillation tank. A plurality of cavities are conductively arranged in the distillation tank from top to bottom, and an exhaust pipeline is conductively arranged in the plurality of cavities. The steam pipeline is introduced into the cavity of the upper layer, and in each cavity, it is coaxially and spacedly wound in a reduced-diameter form along the circumferential direction for multiple turns to form a plurality of heating channels. An annular partition is arranged between two adjacent heating channels. A longitudinal partition is arranged along the radial direction on one side of the annular partition, and a flow port is formed between the longitudinal partition and the annular partition.

[0006] Preferably, the opening directions of adjacent flow ports are opposite.

[0007] Preferably, the cavities are conductively connected through a delivery pipe arranged at the bottom.

[0008] Preferably, the upper end of the delivery pipe is located at the innermost side of the corresponding cavity, and the lower end of the delivery pipe is located at the outermost side of the corresponding cavity.

[0009] Preferably, the steam pipeline is bent and wound in a snake shape for multiple turns in the cavity.

[0010] Preferably, the top end of the exhaust pipe is higher than the top end of the annular partition in the corresponding cavity.

[0011] Preferably, a maintenance port is provided on each of the distillation tanks corresponding to each cavity.

[0012] Preferably, the steam pipes except for the top layer are conductively provided with branch pipes extending to the outside of the distillation tank, and a discharge pipe is conductively connected to the branch pipes; solenoid valves are provided between the branch pipes and the steam pipes, and between the branch pipes and the discharge pipes.

[0013] Preferably, the conveying pipe is conductively connected to a U-shaped pipe provided outside the distillation tank. A liquid discharge pipe and a liquid supply pipe are respectively provided at the upper and lower ends of the U-shaped pipe, and solenoid valves are provided between the liquid supply pipe and the U-shaped pipe, between the liquid discharge pipe and the U-shaped pipe, and between the U-shaped pipe and the conveying pipe.

[0014] Preferably, the bottom end of the conveying pipe is not higher than the top end of the annular partition in the corresponding cavity.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: By coiling the steam pipes in a reduced-diameter form at intervals coaxially in the cavity, the present utility model can extend the path of the steam conveying in the cavity, increase the residence time of the heat in the cavity, and through the arrangement of the annular partition, the flow path of the acetic acid can be extended to realize the full exchange of the heat of the steam in the steam pipe, achieve the effective heating and evaporation of the acetic acid, and improve the distillation effect and efficiency; the arrangement of multiple cavities can further extend the flow paths of the steam and acetic acid to realize the full utilization of resources, reduce the waste of energy, and enhance the practicality of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present application;

[0017] Figure 2 is Figure 1 a cross-sectional view taken along line B-B in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be clearly and completely described below with reference to the drawings and embodiments:

[0019] Such as Figures 1 to 2As shown in the figure, a acetic acid distillation device of the present utility model includes a distillation tank 1, and a liquid adding port and a discharge port are respectively arranged on the distillation tank 1 for adding acetic acid and discharging the liquid after subsequent distillation; an exhaust passage is arranged at the top of the distillation tank 1 for connecting with a condenser to enable the evaporated acetic acid to enter the condenser for condensation and collection; a plurality of cavities 2 are arranged in the distillation tank 1 from top to bottom through a sealing plate 15, and the plurality of cavities 2 are conductively arranged; among them, a steam pipeline 3 is introduced from the upper cavity 2, and is coaxially and spacedly wound in a circumferential direction in a reduced-diameter form in each cavity 2 for multiple turns to form a plurality of heating channels, so as to extend the moving path of the steam, increase the residence time of the steam in the evaporation tank, and further realize the full utilization of heat. The steam pipeline 3 is wound in the lowermost cavity 2 and then led out from the bottom of the distillation tank 1.

[0020] An annular partition plate 4 is arranged between two adjacent heating channels. The annular partition plate 4 is arranged to extend the moving path of acetic acid to realize full heat exchange with the steam and improve the distillation effect; a longitudinal partition plate 5 is arranged along the radial direction on one side of the annular partition plate 4, and a flow port 6 is formed between the longitudinal partition plate 5 and the annular partition plate 4. Among them, the opening directions of adjacent flow ports 6 are opposite to ensure that acetic acid flows from the proximal end to the distal end in sequence and extend its moving path; in addition, the longitudinal partition plate 5 can effectively reduce the short circuit, backflow or swirling of the acetic acid solution during the flowing process, and ensure that the acetic acid flows step by step and orderly along the channel surrounded by the annular partition plate 4. The plurality of cavities 2 are conductively connected through an exhaust pipeline 7. The exhaust pipeline 7 penetrates through the upper and lower cavities 2 to ensure that the acetic acid smoke after being heated and evaporated rises through the exhaust pipeline 7 and enters the condenser. In this embodiment, the top of the exhaust pipeline 7 is higher than the top of the annular partition plate 4 in the corresponding cavity 2 to prevent acetic acid from entering the exhaust pipeline 7.

[0021] Furthermore, adjacent cavities 2 are conductively connected through a conveying pipe 8 arranged at the bottom. A conveying pipe 8 is also arranged at the liquid adding port for the addition and flow of the acetic acid solution. The upper end of the conveying pipe 8 is located at the innermost side of the corresponding cavity 2, and the lower end of the conveying pipe 8 is located at the outermost side of the corresponding cavity 2. That is, the addition of acetic acid at the outside and the discharge of the remaining liquid after distillation at the inside are realized to extend the moving path of acetic acid. In addition, in this embodiment, the bottom end of the conveying pipe 8 is not higher than the top of the annular partition plate 4 in the corresponding cavity 2 to ensure that acetic acid is drained to a specified position and prevent acetic acid from splashing into the internal channel during the falling process and shortening the moving path.

[0022] Furthermore, the steam pipeline 3 is bent and wound in a serpentine shape in the cavity 2 for multiple turns, which can further extend the moving path of the steam, increase the residence time of heat in the distillation tank 1, ensure the heat exchange efficiency, and enhance the distillation effect. In addition, in this embodiment, a maintenance port 9 is arranged on the distillation tank 1 corresponding to each cavity 2 for subsequent targeted maintenance operations, and a sealing cover is arranged at the maintenance port 9.

[0023] Furthermore, a branch pipe 10 extending to the outside of the distillation tank 1 is conductively provided on the steam pipe 3 except for the top layer. A discharge pipe 11 is conductively connected to the branch pipe 10. Solenoid valves are provided between the branch pipe 10 and the steam pipe 3, and between the branch pipe 10 and the discharge pipe 11, so as to realize the individual opening of the steam pipe 3, the branch pipe 10 and the discharge pipe 11. The setting of the branch pipe 10 can supplement steam into the steam pipe 3 according to actual needs. After the steam heat in the upper layer is utilized and consumed, the steam that has undergone heat exchange in the upper cavity 2 can be discharged through the discharge pipe 11, and new steam can be supplemented by the branch pipe 10 to perform heat exchange with the acetic acid entering the lower cavity 2 again to ensure the distillation effect. During operation, when steam supplementation is not required, both the branch pipe 10 and the discharge pipe 11 are in a closed state; when steam supplementation is required, the branch pipe 10 is opened and the discharge pipe 11 is closed. When steam needs to be re-introduced, first close the branch pipe 10, discharge the gas in the steam pipe 3, and then open the branch pipe 10 and close the discharge pipe 11 to realize the re-input of steam. At this time, a solenoid valve is also provided at the upper part where the branch pipe 10 is conductively connected to the steam pipe 3, and the solenoid valve is in a closed state to ensure the downward delivery of steam.

[0024] Furthermore, the delivery pipe 8 is conductively connected to a U-shaped pipe 12 provided outside the distillation tank 1. Drain pipes 13 and liquid supply pipes 14 are respectively provided at the upper and lower ends of the U-shaped pipe 12. Solenoid valves are provided between the liquid supply pipe 14 and the U-shaped pipe 12, between the drain pipe 13 and the U-shaped pipe 12, and between the U-shaped pipe 12 and the delivery pipe 8 to meet the individual opening of each pipe under different working conditions. During operation, when the acetic acid has been fully distilled and there is no need to further perform a distillation reaction downward, the drain pipe 13 can be opened to discharge the distilled liquid; when the acetic acid contains less impurities and the steam heat is relatively large, multiple cavities 2 can be used separately without draining the acetic acid downward. At this time, close the drain pipe 13 and open the liquid supply pipe 14 to supplement the acetic acid to be distilled into the corresponding cavity 2; with such a setting, the practicability of the present invention for different situations is enhanced, and the distillation scheme can be flexibly adjusted according to the impurity content and impurity amount of the acetic acid and the heat of the steam, enriching the use functions of the present invention and enhancing the practicability of the present invention.

[0025] When the present invention is in use, steam is input through the steam pipe 3 and acetic acid is input through the delivery pipe 8. Due to the coiled setting of the steam pipe 3 and the setting of the annular partition 4 in the cavity 2, the moving paths of the steam and the acetic acid can be extended, realizing the full utilization of the steam heat by the acetic acid, ensuring the distillation effect, reducing the waste of energy, and saving production costs; at the same time, the present invention can also formulate different distillation schemes according to the actual working conditions, with rich functions and strong practicability.

Claims

1. An acetic acid distillation device, comprising a distillation tank, wherein a liquid addition port and a discharge port are respectively arranged on the distillation tank, and it is characterized in that: The distillation tank is provided with multiple cavities that are conductively arranged from top to bottom, and an exhaust pipe is conductively arranged in the multiple cavities; the steam pipe is introduced into the cavity of the upper layer and is coaxially and spacedly coiled in a circumferential direction in a reduced-diameter form in each cavity to form multiple heating channels. An annular partition is arranged between adjacent two heating channels, and a longitudinal partition is arranged along the radial direction on one side of the annular partition. A flow port is formed between the longitudinal partition and the annular partition.

2. The acetic acid distillation apparatus according to claim 1, wherein: The opening directions of adjacent flow ports are opposite.

3. The acetic acid distillation device according to claim 1, characterized in that: The cavities are conductively connected through a delivery pipe arranged at the bottom.

4. The acetic acid distillation device according to claim 3, wherein: The upper end of the delivery pipe is located at the innermost side of the corresponding cavity, and the lower end of the delivery pipe is located at the outermost side of the corresponding cavity.

5. The acetic acid distillation device according to claim 1, wherein: The steam pipe is coiled in a serpentine shape in the cavity for multiple turns.

6. The acetic acid distillation apparatus according to claim 1, wherein: The top end of the exhaust pipe is higher than the top end of the annular partition in the corresponding cavity.

7. The acetic acid distillation apparatus according to claim 1, wherein: An inspection port is arranged on the distillation tank corresponding to each cavity.

8. The acetic acid distillation apparatus according to claim 1, characterized in that: Except for the top layer, the steam pipe is conductively provided with a branch pipe extending to the outside of the distillation tank, and a discharge pipe is conductively connected to the branch pipe; electromagnetic valves are arranged between the branch pipe and the steam pipe, and between the branch pipe and the discharge pipe.

9. The acetic acid distillation device according to claim 3, wherein: The delivery pipe is conductively connected to a U-shaped pipe arranged outside the distillation tank. A liquid discharge pipe and a liquid replenishing pipe are respectively arranged at the upper and lower ends of the U-shaped pipe, and electromagnetic valves are arranged between the liquid replenishing pipe and the U-shaped pipe, between the liquid discharge pipe and the U-shaped pipe, and between the U-shaped pipe and the delivery pipe.

10. The acetic acid distillation apparatus according to claim 3, wherein: The bottom end of the delivery pipe is not higher than the top end of the annular partition in the corresponding cavity.

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